Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
Category
Browse anthropogenic (man made industrial deposit) specimens identified by the Rock Identifier community.
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
Green Agate
Silicon dioxide (SiO₂)
Slag (Industrial Glass)
Artificial Vitreous Silicate
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
Mystic Topaz
Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating
Blue tumbled glass-like specimen; likely blue slag glass
Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image
Tumbled opalite (likely man-made glass)
Opalite glass; a synthetic opalescent glass, not a natural mineral species
Diamond (Cut Gemstone)
Carbon (C)
Polished blue-green glassy slag or coated mineral fragment
Most likely man-made colored glass/slag; exact composition cannot be determined visually
Possible tektite or volcanic glass specimen
Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing
Obsidian (Blue)
Volcanic Glass (SiO2)
Blue Cracked Quartz (Dyed Fire Crackle Quartz)
Silicon Dioxide (SiO2) with synthetic dye
Pink Quartz / Sea Glass
Silicon Dioxide (SiO2)
Chert (Arrowhead artifact)
Chert (Cryptocrystalline Silica, SiO2)
Yellow Sapphire (Raw)
Corundum (Al2O3)
Diamond
Carbon (C)
Clear quartz crystal (likely)
Quartz, silicon dioxide (SiO₂)
Rough Sapphire (Corundum)
Corundum (Al2O3)
Goldstone
Aventurine glass (Synthetic glass with copper inclusions)
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
Quartz (likely milky quartz or quartz glass-like fragment)
Quartz, silicon dioxide (SiO₂)
Blue opalite glass (likely man-made)
Opalite glass; a silica-based amorphous glass, not natural opal
Rock crystal quartz fragments
Quartz (silicon dioxide, SiO₂)
Cherry Quartz with Rose Quartz
Crystalline Quartz (SiO2) with glass-based synthetic components
Blue Goldstone
Aventurine Glass
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
Faceted clear gemstone, likely quartz or glass imitation
Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests
Black tumbled stone, possibly obsidian
Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Diamond
Carbon (C)
Diamond
Carbon (C)
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
Ferruginous Slag (Iron Smelting Byproduct)
Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)
Goldstone (Red)
Aventurine Glass (Cupriferous glass)
Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
Blue glassy mineral specimen, possibly dyed or synthetic
Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass
Diamond (Cut jewelry specimen)
Diamond (pure Carbon, C)
Opalite
Synthetic Opalized Glass
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
Blue-dyed tumbled quartz or glass imitation
Quartz (SiO₂), appearance possibly enhanced with blue dye; identity uncertain from image